Pipe coating and wrapping machine



Jan. 29, 1952 J. D. CUMMINGS 2,583,819

PIPE COATING AND WRAPPING MACHINE Filed July 2, 1948 9 Sheets-Sheet l 3 JNVENTOR.

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PIPE comm; AND WRAPPING MACHINE Filed July 2, 1948 9 Sheets-Sheet 2 INVENTOR. damw Q Cumming;

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PIPE COATING AND WRAPPING MACHINE Filed July 2, 1948 9 Sheets-Sheet 3 M Jami Q, eummingg o BY Ell M6.

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Jan. 29, 1952 J. D. CUMMINGS PIPE COATING AND WRAPPING MACHINE 9 Sheets-Sheet 7 Filed July 2, 1948 INVENTOR. James 1), eummiugs A11 n eys Jan. 29, 1952 D cUMMlNGS 2,583,819

PIPE COATING AND WRAPPING MACHINE Filed Julyli, 1948 9 Sheets-Sheet 8 Q 3 I00 14 95 e8 INVENTOR. James Cummini ot um lm I23 I A mugs Jan. 29, 1952 J. D. CUMMINGS PIPE COATING AND WRAPPING MACHINE 9 Sheets-Sheet 9 Filed July 2, 1948 INVENTOR.

James Q Gummi s Patented Jan. 29, 1952 UNITED STATES PATENT OFFICE PIPE COATING AND WRAPPING MACHINE James D. Cummings, Houston, Tex.

Application July 2, 1948, Serial No. 36,689

11 Claims. 1

This invention relates to pipe protection machines, and is an improvement of prior Patent No. 2,359,751 granted October 10, 1944.

It is an object of this invention to provide a pipe protection machine of this class in which traction wheels, on a shaft journalled in bearings rigidly mounted on the frame, are in driving engagement with the upper side of the pipe being processed.

It is a further object of this invention to provide a pipe protection machine of this class in which traction wheels, on a threaded shaft journalled in bearings rigidly mounted on the frame, support the frame from the pipe being processed.

It is still a further object of this invention to provide a pipe protection machine of this class in which rollers are pivotally mounted on the frame for guiding engagement with the lower side of the pipe being processed.

Yet a further object of this invention is to provide a pipe protection machine of this class in which rollers are supported by a toggle Divotally mounted on the frame, so that the rollers may be quickly adjusted and brought into guiding engagement with the lower side of various diameter pipes being processed.

It is also a further object of this invention to provide a pipe protection machine of this class which has integral therewith a heating unit for heating the coating fluid.

It is another object of this invention to provide a pipe protection machine of this class in which the pipe is first coated, then wrapped, and then coated, and in which a heating unit built integrally with the machine heats the fluid of both protective coats.

It isalso another object or this invention to provide a pipe protection machine of this class in which the pipe is first coated, then wrapped, then coated, and then wrapped again, and in which the wrapping heads for applying both wraps are mounted on either side of the means which applies the heated fluid for the second coat.

It is yet another object of this invention to provide a pipe protection machine of this class in which the fluid in the annular coating ring is surrounded by a heating jacl cet.

- drives which operate the coating fluid pumps.

It is an additional object of this invention to provide a pipe protection machine of this class which has a coating shoe which is pulled along the pipe by adjustable tension means connecting the shoe to the frame, and which has on the frame a variable tension adjustable means for tightening the shoe around the pipe.

Other and further objects of this invention will become apparent upon referring to the drawings in which:

Fig. 1 is a plan view of a machine adapted to apply an application of coating material to the pipe surface and to cover this coating with a Wrap which is shown being applied from two wrapping drums so that the webs of wrapping material overlap.

Fig. 2 is a front end elevation taken along line 2-2 of Fig. l.

Fig. 3 is a side elevation taken along line 3-3 of Fig. 1.

Fig. 4 is a rear elevation taken along line 4-4 of Fig. 1.

Fig. 5 is a fragmentary sectional view ofthe yoke, ring gears, and rollers, taken along line 5--5 of Fig. 4.

Fig. 6 is a side elevation of a machine adapted to apply an application of coating material, then to wrap the coating, and then to apply a second coating over the wrap, the wrap being applied from two wrapping drums so that the webs of wrapping material overlap.

Fig. 7 is a rear end elevation taken along line 'l-l of Fig. 6.

Fig. 8 is a fragmentary sectional view through the jacketed coating ring, taken along line 8-8 of Fig. 7.

Fig. 9 is a front end elevation of the lower part of themachine, taken along lines 9-! of Figs. 6 and 10. a

Fig. 10 is a plan view of the lower part of the machine, taken along line l 0-! of Fig. 6.

Fig. 11 is a sectional elevation taken along lines llll of Fig. 10. r a

Fig. 12 is a sectional elevation taken along lines |2l2 of Fig. 10.

Fig. 13 is a partial side elevation of :a machine adapted to apply an application of coating material to the pipe surface, then to wrap over the coating, then to coat the wrapping material, and finally to apply a second wrap, the first wrap being'applied from a single drum of wrapping material and the second wrap being applied from two drums.

Fig. 14 is a sectional end elevation taken along line |4l4 of Fig. 13.

Fig. 15 is a sectional side elevation taken along line l5l5 ofFig. 13, a

Fig. 16 is a partial plan view of a modification of the machine shown in Fig. 13.

Fig. 17, is a fragmentary side elevation of the yoke, ring gears, rollers, and of a portion of the ring gear drive, taken along line l'l-Il of Fig.

Fig. 18 is a fragmentary'sectional end elevation of the yoke, ring gears, rollers, and of a portion of the ring gear drive, taken along line l8--l8ofiFigl16l f q Fig; 19 is a fragmentary sectional side elevation of the yoke, ring gears, rollers, and of'a por--, I

tion of the ring gear drive, taken along line l9l9 of Fig. 16. i

In the form of the invention disclosed in Figs. 1-5, inclusive, 2. machine adapted to apply one coat of. protective material and to wrap-this c'oat with a wrapping material is shown as having. a.

frame I on which is mounted a prime mover 2 such as a gasoline engine which is adapted to 2 drive the wrapping head 3; the traction wheels 4 which propel the machine along the pipe 5 which is being processed, and the pumps 6 and H! which circulate the coating material which is applied to the pipe.

From the prime mover I an interconnecting shaft 1 leads directly to a transmission unit 8. Belt drives 9 and H) are shown passing over pulleys II and I2 on the shaft 7 to'drive respectively the transmissions l3 and I4' which are directly connected-to right angle drives and 16 which, through universals. If and I8, drive 7 the pum'psii and I9; A sump 20 is shown below the pipe 5 and is rigidly connected to the frame I by means of structural members 2| and" the yoke H2 of the wrapping head 3.

The. transmission from the transmission unit 8 to the traction wheels 4" is accomplished by means of the shaft 22 which has the sprocket 23 thereon connected to drive the reducer 24' and through the reducer 24, the sprocket H9 which is mounted on the traction wheel shaft '25. This shaft 25 is journalled in the traction Wheel eccentric 120 radially outward fromthe axis thereof. 1 The eccentric I20 in turn' is mounted on the pillow block 25 which is rigidly mounted 'to the frame I. As the axes of the eccentric and pillow block are concentric', the shifting of the eccentric about the pillow block and. the locking thereof results inrotatably locating the shaft 25 in desired vertical positions. Byproviding means for. vertically positioning the shaft 25, and by threading theshaft 2-5 and a providing a keyway thereal'ong, the wheelskmay be keyed in position along the shaft, and the shaft may thenbe vertically located to drive the machine along pipes of various diameter. A forward pair of wheels 4, mounted by similar adjustable means but not being power driven, is shownlocated forward: of the driven wheels 4 to further support the frame and balance the driving thereof.

The sprocket chain 21, which interconnects V and 4.

mounted, at either end of the rod 341 so that when either of these arms are rotated the guide rollers 30 may be adjustably and flexibly positioned against any diameter of pipe 5 which the machine-may be processing. It is obviously easy to rotate the arms 39 in a reverse direction to release the guide rollers 30 from contact with the pipe 5 The rollers 30 can also be adjustably positioned at Various horizontal distances apart to accommodate various diameter pipe in a horizontal direction, as the threaded shaft permits this adjustment in like-manner as is accomplished Onthe'shaft 25 for'the traction wheels 4'.

The yoke i I2 is mounted to rigidly connectthe upper" members of the frame l" abovethe pipe with the 'surhp 2! below the pipe and this yoke hasrollers H-rotatably supported therefrom as shown in Fig. 5-so that the wrapping head 3 may .be'driven therearound: This driving is accor rrplished through the transmission unit 8" and the shaft 22' which rotates sprocket 42- through a sprocket transmissionsystem 43' journaled in brackets, 44' and 45 supported from the frame I so' that the sprocket 46- intermeshes with the sprocket chain 41' which is shown mounted around the periphery of the sprocket toothed wrapping head 3.

A'brake drum H4 is shown pivot 'lly' mounted on the wrapping head 3, and the shelf-t 48 on V which this drum is mounted issho'wn' as eic tefiding. outwardly therefroiri to receive a roll of wrapping material-. The arm 49 is pivoted in the shaft 43' to' be positioned coaxially therewith when the wrapping=drum is-positiond-On the shaft, after which the arm can be positioned as shown in Fig. 1 by an well-known mechanical means, not shown, within and connected to the shaftv 4B, so that thepivota l' connection US of the shaft. 48 with thedriving head 3' may be changed to i a rigidlconnectionwhen the handle 49 is locked in the positions shown in Figs. 1

unwrapping, head a can have a plurality of wrapping drums mounted thereon, two such drums beifig'. shown mounted in Fig. I while the head shown in Fig. 4' has only a single drum of wrapping material mounted thereon.

To circulatethe coating fluid" the pump i5 is 1 adapted to be connected. at the nipple 55, by

sprocket l2l on thereducer with the sprocket H9 on the traction wheel shaft 25, is shown maintained in tension by means ofthe adjustable take-up sprocket 29 which is mounted on a struc tural member 28 of the frame. i

In order to guide the machine along the lower side of the pipe a'n'd' in order to'pos'ition' thermachine against rocking about the pipe -guide rollers Bil-are provided which are mountedon a threaded shaft 3| which is journalledin bearings 32- -mouiit'ed Oh arms: 33 whioli'all'e pivoted from a the sump 20. I

means of afleXible hose,ft'o a portable container,

not shown,.,which has thereinv heated coating fluid.

Thepump takes suction from this fiexiblehose and-delivers the. coating,- fluid into the sump; 20

through the line 5|- The pump 6 on the opposite sideof the machine takessuction from the sump 20- through the line 52- and discharges through the line: 53 either back into" the sump through the line 54 or upwardly through the line 55- and through the-downspout 56 into the coating shoe 511 which is adapted ,to ride along the pipegas the machine progresses. The line 55 has bubble trap 58 thereon and a vent 59, as shown in Fig. 3, to act as a buffer against successive discharges and to ventthe: air" bubbles which may be entrappedin the coating-fluid, i

aesasm The shoe 5'! is joined together in hinged segments 60 and the shoe can be tightened around various diameter pipes by means of turning the handle 6! which is connected tothe shoe through the line 62, the spring 63 and the pulley 64 which is pivotally mounted on the frame I. The shoe 5! is attached to be pulled along with themachine by means of the lines 65 andthe chain 66 which can be adjustably positioned in the hook 61 which is rigidly fixed to a structural member 2| of the frame 1.

In this form of the machine the sump is not heated but a fuel tank 10 is provided to "carry fuel along with the machine as a reservoir to fill the heated torch which has to be applied to the sump to heat up any coating material therein prior to putting the machine in use.

In the form of the invention disclosed in Figs. 6 through 12, inclusive, 2. machine is shown which is adapted to apply a coating to the pipe 5 by means of the shoe 51; it is then adapted to wrap over the coating thus applied by a wrapping head of similar design as that disclosed in Fig. 3; and the machine is then adapted to apply a second coating of protective material over the wrap thus applied through the coating head.

In this machine the driving mechanism and structural features of the frame and sump are similar to the modification of the machine hereinbefore described. It differs in that the sump is heated and the piping of the machine is so adapted to feed coating material to and to circulate coating material from both the coating shoe 5'! and the coating head 68.

In this machine the coating material is taken by pump 19 from the reservoir tank through the flexible connection connected to the nipple 5i), and suction can also be taken directly from the sump through the spout 69. The pump is then adapted to discharge through line H into line 12 which passes through a duct l3, which passes below and on the side of the sump to the coating head 68 where it is designed to discharge upwardly into an annular ring 14 of a sufiicient diameter to surround the largest type of pipe contemplated by the size of the particular model of the machine, and through this ring the fluid discharges radially through orifice plugs 15 onto the pipe to be coated. The orifice plugs are adapted to be brought into proximity with various diameters of pipe to be coated by changing the lengths of the nipples Hi which connect with plugs into the annular ring.

The fluid falls from the pipe thus coated into the drip pan 1'! and runs down the pan to fall by "gravity into the reservoir 18. A pipe 19 is shown connected to the bottom of the reservoir 18 and this pipe passes through a duct 80 to the suction side of the pump 6. Asinthe modification previously described this pump is adapted to discharge fluid either back into the sump or upwardly to fall into the shoe 5'1. In this modification the bubble trap shown in Fig. 3 has been omitted for reasons of clarity of description but such equipment may be provided.

In this device the fuel reservoir H3 is piped by means of the fuel line 8| to a burner 82 which is integrally affixed to the sump so that the products of combustion from the burner discharge into the heating jacket 83 beneath the sump and are deflected by means of the bafiles 84 into the ducts l3 and 80 and from thence upwardly through the jacket 85 which surrounds the reservoir 18 and through connection ducts 86 to. the annular jacket 81 which surrounds the annular coating ring 14. From the jacket 81 the are hausted products of combustion are discharged outwardly through the vent 88. It is thus possible in the device of this machine to maintain and circulate heated coating fluid to both the shoe and the coating head.

Figs. 13, 14 and 15 show a modification of the machine adapted to coat, then wrap, then coat. then again wrap a pipe to be processed and in this machine a coating head 68 insures that the second coating is applied in the same manner as in the modification of the machine described immediately above.

In the device of this machine a sprocket wheel 89 is driven from the transmission 8 through a transmission system similar to that of Fig. 1 so as to turn a shaft 90 in a manner to drive both wrapping heads 9| and 92. In this modification of the machine the coating head 68 serves the same function as the yoke I l2 to structurally support the bearings 93 in which the shaft 90 turns to drive both the sprocket 94 to propel the inside wrapping head 9| and the sprocket 93 to propel the outside wrapping head 92.

In this machine the sprocket 94 is twice the diameter of the sprocket so that the inner wrapping head 9| turns twice as fast as the outer wrapping head 92 so that a single drum of wrapping material 96 covers the first protective coating applied by the shoe while two drums of wrapping material 91 mounted on the outer wrapping head 92 overlap in applying the protective wrap over the coating which has been applied through the coating head 68.

It should be noted that in this modification the sprockets 94 and 95 are hooded by a guard I90 which is a rigidly extending member from the coating head frame 68.

Figs. 16 through 19, inclusive, show a modification of the machine adapted to apply two coats and two wraps but in this machine, which is adapted to serve smaller diameter pipes, it is not found necessary to maintain a heated coating head 68 and the second coat as 'well as the first coat of material is applied by the pump ii, not shown, the second coat falling from spout H8 beside yoke H3, shown in Fig. 16, to fall by gravity on the pipe 5 and from thence to fall into the sump 29 which underlies the after part of the machine below the wrappinghead section.

In this machine no hood or guard is shown over the sprockets and chain constituting the driving transmission. The sprocket I02 is driven from the transmission 8, and is mounted on shaft Hi9 which is journaled in bearing 1193 which is rigidly mounted on yoke I I6. Shaft I09 alsohas thereon sprocket I94 and sprocket 35, the sprocket Hi4 being meshed to drive the annular sprocket chain to? of the outer wrapping head. The sprocket [05, by means of sprocket chain I06, drives the sprocket Ill which is mounted on shaft I98, this shaft being journaled in bearing H0 rigidly mounted on the yoke H6. The shaft I88 has on the inner end thereof the sprocket Ill, twice the diameter of the sprocket I04 and this sprocket is meshed to drive the inner wrapping head so that this head, containing a single drum of wrapping material, has twice the speed of the outer wrapping head.

It is obvious that the improvements of the device of this invention are devised to provide a pipe protection machine in which the machine is driven along the pipe by traction wheels on shafts in pillow blocks rigidly mounted to the frame above the pipe so that the wheels support ass s-1e- 7. the frame; from. the; pipe and in this improve? ment: the'guide rollers benea-th the pipe which keep the; machine from tilting as itprogresses onwardly are'pivotally positioned from the sump and this improvement admits of great flexibility and rapidity of adjustment;

This feature, inv combination with the incor-' poration of themeans for maintaining the. sump heated by heating units integrally attached thereto, results in a greatlyimprovedpi-pe protection machine and in machines of this class where it is desirable to applya second coating of material over the wrapping of the first coating, the in corporation of a second coating head which: is'

7 an annular ring. surrounded by a heated jacket I to pipe.- comprising, a frame entending longitudinallyaboutsaidpipe, hearings rigidly mounted on said frame, a threaded shaft journalled in said bearings, tractionv/heels on said shaft for driving engagement with the upper side of said pipe, a. sump comprised in said frame, roller support'means pivotally attached to said sump, rollers thereonadapted by said support means 7 to be guided into engagement with the lower side of said pipe, a pipe coating and a pipe wrapping device. supported by said frame, and means on said frame for driving said devices and said traction wheel's, said coating device including a jacketed ring supported fromsaid sump to surround said pipe and apply liquid thereto, a combustion chamber beneath said sump and integral there with, and means for conducting heat through said chamber and jacket.

2. A machine for applying protective materials to pipe comprising, a frame extending longitu- 1 dinally about said pipe,,bearings rigidly mounted on said frame, a threaded shaft journalled in said hearings, traction wheels on said shaft for driving engagement with the upper side of said pipe, a sump comprised in said frame, toggle .on said frame, a threaded shaft journalled in said bearings, traction wheels on said shaft for driving engagement'with the upper side of said pipe, a sump comprised in said frame, roller support means'pivotally attached to. said sump, rollers thereon adapted by said support means to be guided into engagement with the lower side of said pipe, pumps connected to said sump, transmissions on said frame for driving said tractions wheels, right angle drives on said frame for driving said pumps, wrapping means supported from said frame, and a single prime mover on 7 4.- Ama-chine-for applying-protective materials to pipe comprising, a frame extending longitudinally about said pipe, bearings rigidly mounted on said. frame, a threaded shaft journalledi in said bearings, tractionwheels on said shaft for driving; engagement with the upper side of'saidpipe, a sump comprised in said frame, roller support means pivotally attached to said. sump, rollers thereonadapted by. said supportme'ansto beguidedainto engagement. withv thelower side of said pipe, a shoe surrounding said pipe for" applying coating. material to the surface of'sai'd pipe, a. line for conductingv coating liquid from said sump to. saidpipe above said shoe,,a bubble trap in said- Iine,. pumps connected to said sump for supplying. coating. liquidv to said line, wrapping means supported from said. frame,- and means on said frame. for driving, said traction wheels, pumps, and Wrapping means.

5. A machine for applying protective materials to pipe comprising, a frame extending longitu; dinally about said pipe, bearings rigidiy mounted on said frame, adjustable eccentric means; insaid bearings, a threaded shaft journalled' in said e'c'- centric means to be positioned by said" eccentric at various elevations. to accommodate various diameter pipes', traction wheels on said" shaft for driving engagement. with the u per sideof said pipe, a sump comprisedin said frame, roller 7 support means pivotally attached. to said sump;

rollers thereon adapted by. said, support" means to be guided intoengagement with the lower'side of said pipe, a shoe surrounding sai'd'pipefor applying' coating material to the surface ofsaid pipe, adjustable means for connecting said slide andframe, means on said frame for tightening said shoe about said pipe; a line for'conducting coating liquid from said sump to saidpipeabove said shoe, a bubble trap in said line, pumpscon neoted to said sump for'supplyingcoating liquid to said line, wrapping means supported from said frame, and means on said frame for driving said traction wheels, pumps, and wrapping means.

6. A combination pipe coating and wrapping machine comprising, a frame extending longitudinally about said pipe; bearings rigidly mounted on said frame, a threaded shaft journalled insaid bearings, tractionwl'ieels on said shaft for driv ing engagement with the upper side of said pipe, a sump comprised insaid frame, pumpme'ans cohnected-to' said sump-for transferring coating fluid to and from said pipe, rollersupport means pit otally attached to said sump, rollers thereon adapted by said support means to-be guided into engagement with the lower side of said pipe, a jacketed ringsupported from said sump to surround-said pipe and apply liquid thereto, a combustion'cha-mber beneath s'aidsump and integral therewith, means for conducting. heat through said chamber and jacket, pipe Wrappingmean's supported by said frame, and a primemover' on 7 said frame connected to drive said traction Wheels" pump pp g means.

' 7-. A combination pipe coating and wrapping machine corriprising, a frame extending longitur V driving engagement with the upper side: of said pipe,.a sump comprised in saidframe, pumpmeans connected to said sump for transferringcoating fiuid to and from said pipe, roller-support means pivotally attached to said sump, rollers thereon adapted by said supportmeans to beguided into engagement with the lower side of said pipe, a jacketed r'i'rig' supportedfrom said sump to surround said pipe and apply liquid thereto, a combustion chamber beneath said sump and integral therewith, means for conducting heat through said chamber and jacket, pipe wrapping means supported by said ring, and a prime mover on said frame connected to drive said traction wheels, pump means, and wrapping means.

8. A combination pipe coating and wrapping machine comprising, a frame extending longitudinally about said pipe, bearings rigidly mounted on said frame, adjustable eccentric means in said bearings, a threaded shaft journalled in said eccentric means to be positioned by said eccentric at various elevations to accommodate various diameter pipes, traction wheels on said shaft for driving engagement with the upper side of the pipe, a sump comprised in said frame, roller support means pivotally attached to said sump, rollers thereon adapted by said support means to be guided intc engagement with the lower side of said pipe, a yoke suspended from said frame, ring gears carried on opposite sides of said yoke for rotation around said pipe, wrapping material holders carried by said ring gears, a coating device carried by said frame forwardly of said ring gears, a second coating device supported by said yoke, pumps connected to said sump for transmitting fluid to said coating devices, and a single prime mover on said frame connected to drive said traction wheels, ring gears, and pumps.

9. A combination pipe coating and wrapping machine comprising, a frame extending longitudinally about said pipe, bearings rigidly mounted on said frame, adjustable eccentric means in said bearings, a threaded shaft journalled in said eccentric means to be positioned by said eccentric at various elevations to accommodate various diameter pipes, traction wheels on said shaft for driving engagement with the upper side of the pipe, a sump comprised in said frame, roller support means pivotally attached to said sump. rollers thereon adapted by said support means to be guided into engagement with the lower side of said pipe, a yoke suspended from said frame, ring gears carried on opposite sides of said yoke for rotation around said pipe, wrapping material holders carried by said ring gears, a coating device carried by said frame forwardly of said ring gears, a second coating device supported by said sump, pumps connected to said sump for transmitting fluid to said coating devices, and a single prime mover on said frame connected to drive said traction wheels, ring gears, and pumps.

10. A machine for applying protective ma" terials to pipe comprising, a frame extending longitudinally about said pipe, bearings rigidly mounted on said frame, adjustable eccentric means in said bearings, a threaded shaft journalled in said eccentric means to be positioned by said eccentric at various elevations to accommodate various diameter pipes, traction wheels on said shaft for driving engagement with the upper side of said pipe, a sump comprised in said frame, roller support means pivotally attached to said sump, rollers thereon adapted by said support means to be guided into engagement with the lower side of said pipe, wrapping means supported from said frame, pipe coating means consisting of a shoe surrounding said pipe for applying coating material to the surface of said pipe, adjustable means for connecting said shoe and frame, means on said frame for tightening said shoe about said pipe, a line for conducting coating liquid from said sump to said pipe above said shoe, a bubble trap in said line, pumps connected to said sump for supplying coating liquid to said line, there being means on said frame for driving said traction wheels, pumps, and wrapping means.

11. A machine for applying protective materials to pipe comprising, a frame extending longitudinally about said pipe, bearings rigidly mounted on said frame, adjustable eccentric means in said bearings, a threaded shaft journalled in said eccentric means to be positioned by said eccentric at various elevations to accommodate various diameter pipes, traction wheels on said shaft for driving engagement with the upper side of said pipe, a sump comprised in said frame, roller support means pivotally attached to said sump, rollers thereon adapted by said support means to be guided into engagement with the lower side of said pipe, a shoe surrounding said pipe for applying coating material to the surface of said pipe, adjustable means for connecting said shoe and frame, means on said frame for tightening said shoe about said pipe, a line for conducting coating liquid from said sump to said pipe above said shoe, a bubble trap in said line, a jacketed ring supported from said sump to surround said pipe and apply liquid thereto, a combustion chamber beneath said sump and integral therewith, means for conducting heat through said chamber and jacket, pumps connected to said sump for supplying coating liquid to said line and to said jacketed ring, wrapping means supported from said frame for wrapping said pipe after it is coated by said shoe and before it is coated by said jacketed ring, and means on said frame for driving said traction wheels, pumps, and wrapping means.

JAMES D. CUMMINGS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,340,326 Horrigan Feb. 1, 1944 2,344,264 Perrault Mar. 14, 1944 2,359,751 Cummings et a1. Oct. 10, 1944 2,471,580 Perrault et al. May 31, 1949 

